DM74AS874
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DM74AS874 - DM74AS874
DM74AS874 Dual 4-Bit D-Type Edge-Triggered Flip-Flop
October 1986 Revised July 2003
DM74AS874 Dual 4-Bit D-Type Edge-Triggered Flip-Flop
These dual 4-bit inverting registers feature totem-pole 3STATE outputs designed specifically driving highlycapacitive relatively low-impedance loads. highimpedance state increased high-logic-level drive provide these registers with capability being connected directly driving lines bus-organized system without need interface pull-up components. They particularly attractive implementing buffer registers, ports, bidirectional drivers, working registers. eight flip-flops DM74AS874 edge-triggered D-type flip-flops. positive transition clock, outputs will logic states that were inputs. buffered output control input used place eight outputs either normal logic state (HIGH logic levels) high-impedance state. high-impedance state outputs neither load drive lines significantly. output control does affect internal operation flip-flops. That data retained data entered even while outputs OFF. pinout arranged ease printed circuit board layout. data inputs side package, while outputs other side.
Features
Switching specifications Switching specifications guaranteed over full temperature range Advanced oxide-isolated, ion-implanted Schottky process 3-STATE buffer-type outputs drive lines directly Space saving wide package structured pinout
Ordering Code:
Order Number DM74AS874WM DM74AS874NT Package Number M24B N24C Package Description 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Devices also available Tape Reel. Specify appending suffix letter ordering code.
Connection Diagram
2003 Fairchild Semiconductor Corporation
DS006331
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DM74AS874
Function Table
Inputs Output
Logic Diagram
State HIGH State Don't Care Positive Edge Transition High Impedance State Previous Condition
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DM74AS874
Absolute Maximum Ratings(Note
Supply Voltage Input Voltage Voltage Applied Disabled Output Operating Free Temperature Range Storage Temperature Range Typical Package 47.0°C/W 5.5V +70°C
Note "Absolute Maximum Ratings" those values beyond which safety device cannot guaranteed. device should operated these limits. parametric values defined Electrical Characteristics tables guaranteed absolute maximum ratings. "Recommended Operating Conditions" table will define conditions actual device operation.
-65°C +150°C
Recommended Operating Conditions
Symbol fCLK tWCLK tWCLR Supply Voltage HIGH Level Input Voltage Level Input Voltage HIGH Level Output Current Level Output Current Clock Frequency Width Clock Pulse Width Clear Pulse Setup Time (Note Data Hold Time (Note Free Operating Temperature HIGH Data Clear Inactive Parameter Units
Note arrow indicates positive edge Clock used reference.
Electrical Characteristics
over recommended operating free temperature range. typical values measured 25°C. Symbol (Note IOZH IOZL HIGH Level Output Voltage Level Output Voltage HIGH Level Input Current Level Input Current Output Drive Current OFF-State Output Current, HIGH Level Voltage Applied OFF-State Output Current, Level Voltage Applied Supply Current Parameter Input Clamp Voltage Conditions 4.5V, 4.5V, Max, 4.5V 5.5V 4.5V, 5.5V, 2.7V 5.5V, 0.4V 5.5V, 2.25V 5.5V, 2.7V, 5.5V, 0.4V 5.5V Outputs OPEN Outputs HIGH Outputs Outputs Disabled 0.35 -0.5 -112 -1.2 Units
Input Current Input Voltage 5.5V,
Note output conditions have been chosen produce current that closely approximates one-half true short-circuit current, IOS.
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DM74AS874
Switching Characteristics
over recommended operating free temperature range Symbol Parameter Conditions fMAX tPLH tPHL Maximum Clock Frequency Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output tPZH Output Enable Time HIGH Level Output tPZL Output Enable Time Level Output tPHZ Output Disable Time from HIGH Level Output tPLZ Output Disable Time from Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output Clear Output Control Output Control Output Control Output Control 4.5V 5.5V Clock Clock From 10.5 Units
10.5
11.5
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DM74AS874
Physical Dimensions inches (millimeters) unless otherwise noted
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Package Number M24B
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DM74AS874 Dual 4-Bit D-Type Edge-Triggered Flip-Flop
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Package Number N24C
Fairchild does assume responsibility circuitry described, circuit patent licenses implied Fairchild reserves right time without notice change said circuitry specifications. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT FAIRCHILD SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user. www.fairchildsemi.com critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness. www.fairchildsemi.com
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